koseki.t.u-tokyo.ac.jp
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:12:be:8a:ec:d0:76:2b:79:ca:7b:d0:97:7a:f3:4e:3e:72 was issued on by Let's Encrypt.
With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=koseki.t.u-tokyo.ac.jp
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:12:be:8a:ec:d0:76:2b:79:ca:7b:d0:97:7a:f3:4e:3e:72Serial Number (int): 267715215059187940159148774937021538778738
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 3c:2f:3a:86:49:91:b5:a6:72:8f:22:9f:8f:47:93:63:8d:41:47:ca
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 12:c8:c5:4e:4d:81:67:18:25:e3:13:76:40:58:3e:43:41:3c:13:c1
Fingerprint (sha256): 04:37:24:bb:aa:a1:4b:a3:7d:51:3d:ee:c2:f8:0a:76:f4:f0:29:ed:69:15:1e:90:f1:3d:49:22:92:bf:bf:7c
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate koseki.t.u-tokyo.ac.jp
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for koseki.t.u-tokyo.ac.jp
Public Key Algorithm
RSA
Key Size
2048
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
koseki.t.u-tokyo.ac.jp
www.koseki.t.u-tokyo.ac.jp
www.koseki.t.u-tokyo.ac.jp
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Certificate
The complete raw certificate details for koseki.t.u-tokyo.ac.jp in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFfzCCBGegAwIBAgISAxK+iuzQdit5ynvQl3rzTj5yMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODEyMTgwMzA2MDBaFw0x OTAzMTgwMzA2MDBaMCExHzAdBgNVBAMTFmtvc2VraS50LnUtdG9reW8uYWMuanAw ggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDQF68g+yr7wAPs4f6ZGf72 /Bt+h6V1NqADgp5X4lHKT91NhxU5EnrYhgv9DQM3iZZM76VtUsWp3MDntfA0Xx0H /ok7nbeq01OLgaCS6lY/3Pgat+3EoFzkqO9kljw4fZtjFIcdpzRWp4d5MBWdACiL aq2IPlDK4LtFbKGUztHRGDdsC/JeHR5+GoLh3LSRWGTxmJQz0v8OSy4uXtN0ZmPQ DIO8w8p9/8UeOBKoo7QxwynINBBCqXt9QrNG4PW8XjBl69GnsT30A4rUSmymUkdu P5mFpIUmN/ODTu8M42/LRJGvImMbhqHCCtDDURwWvDbOt7pLT9W23agVFRCimE3t AgMBAAGjggKGMIICgjAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUH AwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFDwvOoZJkbWmco8i n49Hk2ONQUfKMB8GA1UdIwQYMBaAFKhKamMEfd265tE5t6ZFZe/zqOyhMG8GCCsG AQUFBwEBBGMwYTAuBggrBgEFBQcwAYYiaHR0cDovL29jc3AuaW50LXgzLmxldHNl bmNyeXB0Lm9yZzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50LXgzLmxldHNl bmNyeXB0Lm9yZy8wPQYDVR0RBDYwNIIWa29zZWtpLnQudS10b2t5by5hYy5qcIIa d3d3Lmtvc2VraS50LnUtdG9reW8uYWMuanAwTAYDVR0gBEUwQzAIBgZngQwBAgEw NwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5j cnlwdC5vcmcwggEDBgorBgEEAdZ5AgQCBIH0BIHxAO8AdgB0ftqDMa0zEJEhnM4l T0Jwwr/9XkIgCMY3NXnmEHvMVgAAAWe/fe6dAAAEAwBHMEUCICgc1ZImMdYevnKs IV2fsOXDRjgH2FL6R1ARm6RND5i5AiEAvOa7zGwr/MAiHrfxTYnKJyW5tQI1Tuve MaLG31lp2vYAdQApPFGWVMg5ZbqqUPxYB9S3b79Yeily3KTDDPTlRUf0eAAAAWe/ ffDpAAAEAwBGMEQCIFxTjttmVPF9aRTcO9RMPbtM587yahCt5Dcu0SxCJeylAiAY utRgjYzB8FMZxFVaBmKa46/Rh4AUUTf+yr1i75TwGzANBgkqhkiG9w0BAQsFAAOC AQEAZoWBl5KmnK10R82cN60mHj6Npzofj9mYeetnkWFORX/8QU+lv++mL7pNvuiO YPCifM24Wz7GShPHGGHNHxM8/nRBXcT5og+Esz5Tf7pd4fta0sJs6Hr45jxQYHqz 7DNGtjeW5E2tWbS234nz5Vi4uGqvy8Nk/+Lgk/sI6S+5nq5gxg3AJnnacc+uVD9H TBp+PbukS/P0BLkBa+VNgJryhMmrs1q2fcW7S/1hNRYyr7WUtlUDvrFfGFz7Anqz 6KTlW8gcs4ah/C5+5+kV2GVrlwsZhs2/eBnDRumE9araB2KHCIVtqxsArNU++NSE A2F/Kzv8DXJ9VPzyT6VS/3fiGw== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0BevIPsq+8AD7OH+mRn+ 9vwbfoeldTagA4KeV+JRyk/dTYcVORJ62IYL/Q0DN4mWTO+lbVLFqdzA57XwNF8d B/6JO523qtNTi4GgkupWP9z4GrftxKBc5KjvZJY8OH2bYxSHHac0VqeHeTAVnQAo i2qtiD5QyuC7RWyhlM7R0Rg3bAvyXh0efhqC4dy0kVhk8ZiUM9L/DksuLl7TdGZj 0AyDvMPKff/FHjgSqKO0McMpyDQQQql7fUKzRuD1vF4wZevRp7E99AOK1EpsplJH bj+ZhaSFJjfzg07vDONvy0SRryJjG4ahwgrQw1EcFrw2zre6S0/Vtt2oFRUQophN 7QIDAQAB -----END PUBLIC KEY-----
ASN.1 decoded
[c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2 . . . . . . . . [c:0|t:2|false] INTEGER 267715215059187940159148774937021538778738 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-12-18 03:06:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-18 03:06:00 +0000 UTC . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'koseki.t.u-tokyo.ac.jp' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 26269246496456549609328410511006910339028779588737514042266007795673644972225540933336953110302865248519197395309042355227125697317845012516043795485438030355962239708131734523172705209809776150042848673985904462355832514546627979410483321517102607775334347855330529604318493115505851203728035463584797290008291813871925569319868952847738407851634264113902714950142289913066611871618194358402006279902522618629229351387161927882065857284189281901258183735524465552024667746034587054981707043608534521697118977669589975372154511143011333587203244303016452458990483150542425408100037306535664909464996800576302037356013 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537 . . . . . . . . [c:2|t:3|true] ORAddress . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits) 05a0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) 3c2f3a864991b5a6728f229f8f4793638d4147ca . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (99 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.int-x3.letsencrypt.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://cert.int-x3.letsencrypt.org/' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (54 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'koseki.t.u-tokyo.ac.jp' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.koseki.t.u-tokyo.ac.jp' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (69 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes) 00ef007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc5600000167bf7dee9d00000403004730450220281cd5922631d61ebe72ac215d9fb0e5c3463807d852fa4750119ba44d0f98b9022100bce6bbcc6c2bfcc0221eb7f14d89ca2725b9b502354eebde31a2c6df5969daf6007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000167bf7df0e9000004030046304402205c538edb6654f17d6914dc3bd44c3dbb4ce7cef26a10ade4372ed12c4225eca5022018bad4608d8cc1f05319c4555a06629ae3afd18780145137fecabd62ef94f01b . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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